crypto/conf/conf.c

   1 /* crypto/conf/conf.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include "stack.h"
  63 #include "lhash.h"
  64 #include "conf.h"
  65 #include "buffer.h"
  66 #include "err.h"
  67
  68 #include "conf_lcl.h"
  69
  70 #ifndef NOPROTO
  71 static void value_free_hash(CONF_VALUE *a, LHASH *conf);
  72 static void value_free_stack(CONF_VALUE *a,LHASH *conf);
  73 static unsigned long hash(CONF_VALUE *v);
  74 static int cmp(CONF_VALUE *a,CONF_VALUE *b);
  75 static char *eat_ws(char *p);
  76 static char *eat_alpha_numeric(char *p);
  77 static void clear_comments(char *p);
  78 static int str_copy(LHASH *conf,char *section,char **to, char *from);
  79 static char *scan_quote(char *p);
  80 static CONF_VALUE *new_section(LHASH *conf,char *section);
  81 static CONF_VALUE *get_section(LHASH *conf,char *section);
  82 #else
  83 static void value_free_hash();
  84 static void value_free_stack();
  85 static unsigned long hash();
  86 static int cmp();
  87 static char *eat_ws();
  88 static char *eat_alpha_numeric();
  89 static void clear_comments();
  90 static int str_copy();
  91 static char *scan_quote();
  92 static CONF_VALUE *new_section();
  93 static CONF_VALUE *get_section();
  94 #endif
  95
  96 #define scan_esc(p)     ((*(++p) == '\0')?(p):(++p))
  97
  98 char *CONF_version="CONF part of SSLeay 0.8.1b 29-Jun-1998";
  99
 100 LHASH *CONF_load(h,file,line)
 101 LHASH *h;
 102 char *file;
 103 long *line;
 104         {
 105         LHASH *ret=NULL;
 106         FILE *in=NULL;
 107 #define BUFSIZE 512
 108         int bufnum=0,i,ii;
 109         BUF_MEM *buff=NULL;
 110         char *s,*p,*end;
 111         int again,n,eline=0;
 112         CONF_VALUE *v=NULL,*vv,*tv;
 113         CONF_VALUE *sv=NULL;
 114         char *section=NULL,*buf;
 115         STACK *section_sk=NULL,*ts;
 116         char *start,*psection,*pname;
 117
 118         if ((buff=BUF_MEM_new()) == NULL)
 119                 {
 120                 CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
 121                 goto err;
 122                 }
 123
 124         in=fopen(file,"rb");
 125         if (in == NULL)
 126                 {
 127                 SYSerr(SYS_F_FOPEN,errno);
 128                 CONFerr(CONF_F_CONF_LOAD,ERR_R_SYS_LIB);
 129                 goto err;
 130                 }
 131
 132         section=(char *)Malloc(10);
 133         if (section == NULL)
 134                 {
 135                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 136                 goto err;
 137                 }
 138         strcpy(section,"default");
 139
 140         if (h == NULL)
 141                 {
 142                 if ((ret=lh_new(hash,cmp)) == NULL)
 143                         {
 144                         CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 145                         goto err;
 146                         }
 147                 }
 148         else
 149                 ret=h;
 150
 151         sv=new_section(ret,section);
 152         if (sv == NULL)
 153                 {
 154                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 155                 goto err;
 156                 }
 157         section_sk=(STACK *)sv->value;
 158
 159         bufnum=0;
 160         for (;;)
 161                 {
 162                 again=0;
 163                 if (!BUF_MEM_grow(buff,bufnum+BUFSIZE))
 164                         {
 165                         CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
 166                         goto err;
 167                         }
 168                 p= &(buff->data[bufnum]);
 169                 *p='\0';
 170                 fgets(p,BUFSIZE-1,in);
 171                 p[BUFSIZE-1]='\0';
 172                 ii=i=strlen(p);
 173                 if (i == 0) break;
 174                 while (i > 0)
 175                         {
 176                         if ((p[i-1] != '\r') && (p[i-1] != '\n'))
 177                                 break;
 178                         else
 179                                 i--;
 180                         }
 181                 /* we removed some trailing stuff so there is a new
 182                  * line on the end. */
 183                 if (i == ii)
 184                         again=1; /* long line */
 185                 else
 186                         {
 187                         p[i]='\0';
 188                         eline++; /* another input line */
 189                         }
 190
 191                 /* we now have a line with trailing \r\n removed */
 192
 193                 /* i is the number of bytes */
 194                 bufnum+=i;
 195
 196                 v=NULL;
 197                 /* check for line continuation */
 198                 if (bufnum >= 1)
 199                         {
 200                         /* If we have bytes and the last char '\\' and
 201                          * second last char is not '\\' */
 202                         p= &(buff->data[bufnum-1]);
 203                         if (    IS_ESC(p[0]) &&
 204                                 ((bufnum <= 1) || !IS_ESC(p[-1])))
 205                                 {
 206                                 bufnum--;
 207                                 again=1;
 208                                 }
 209                         }
 210                 if (again) continue;
 211                 bufnum=0;
 212                 buf=buff->data;
 213
 214                 clear_comments(buf);
 215                 n=strlen(buf);
 216                 s=eat_ws(buf);
 217                 if (IS_EOF(*s)) continue; /* blank line */
 218                 if (*s == '[')
 219                         {
 220                         s++;
 221                         start=eat_ws(s);
 222                         end=eat_alpha_numeric(start);
 223                         p=eat_ws(end);
 224                         if (*p != ']')
 225                                 {
 226                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 227                                 goto err;
 228                                 }
 229                         *end='\0';
 230                         if (!str_copy(ret,NULL,&section,start)) goto err;
 231                         if ((sv=get_section(ret,section)) == NULL)
 232                                 sv=new_section(ret,section);
 233                         if (sv == NULL)
 234                                 {
 235                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 236                                 goto err;
 237                                 }
 238                         section_sk=(STACK *)sv->value;
 239                         continue;
 240                         }
 241                 else
 242                         {
 243                         pname=s;
 244                         psection=NULL;
 245                         end=eat_alpha_numeric(s);
 246                         if ((end[0] == ':') && (end[1] == ':'))
 247                                 {
 248                                 *end='\0';
 249                                 end+=2;
 250                                 psection=pname;
 251                                 pname=end;
 252                                 end=eat_alpha_numeric(end);
 253                                 }
 254                         p=eat_ws(end);
 255                         if (*p != '=')
 256                                 {
 257                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_EQUAL_SIGN);
 258                                 goto err;
 259                                 }
 260                         *end='\0';
 261                         p++;
 262                         start=eat_ws(p);
 263                         while (!IS_EOF(*p))
 264                                 p++;
 265                         p--;
 266                         while ((p != start) && (IS_WS(*p)))
 267                                 p--;
 268                         p++;
 269                         *p='\0';
 270
 271                         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 272                                 {
 273                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 274                                 goto err;
 275                                 }
 276                         if (psection == NULL) psection=section;
 277                         v->name=(char *)Malloc(strlen(pname)+1);
 278                         v->value=NULL;
 279                         if (v->name == NULL)
 280                                 {
 281                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 282                                 goto err;
 283                                 }
 284                         strcpy(v->name,pname);
 285                         if (!str_copy(ret,psection,&(v->value),start)) goto err;
 286
 287                         if (strcmp(psection,section) != 0)
 288                                 {
 289                                 if ((tv=get_section(ret,psection))
 290                                         == NULL)
 291                                         tv=new_section(ret,psection);
 292                                 if (tv == NULL)
 293                                         {
 294                                         CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 295                                         goto err;
 296                                         }
 297                                 ts=(STACK *)tv->value;
 298                                 }
 299                         else
 300                                 {
 301                                 tv=sv;
 302                                 ts=section_sk;
 303                                 }
 304                         v->section=tv->section;
 305                         if (!sk_push(ts,(char *)v))
 306                                 {
 307                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 308                                 goto err;
 309                                 }
 310                         vv=(CONF_VALUE *)lh_insert(ret,(char *)v);
 311                         if (vv != NULL)
 312                                 {
 313                                 sk_delete_ptr(ts,(char *)vv);
 314                                 Free(vv->name);
 315                                 Free(vv->value);
 316                                 Free(vv);
 317                                 }
 318                         v=NULL;
 319                         }
 320                 }
 321         if (buff != NULL) BUF_MEM_free(buff);
 322         if (section != NULL) Free(section);
 323         if (in != NULL) fclose(in);
 324         return(ret);
 325 err:
 326         if (buff != NULL) BUF_MEM_free(buff);
 327         if (section != NULL) Free(section);
 328         if (line != NULL) *line=eline;
 329         if (in != NULL) fclose(in);
 330         if ((h != ret) && (ret != NULL)) CONF_free(ret);
 331         if (v != NULL)
 332                 {
 333                 if (v->name != NULL) Free(v->name);
 334                 if (v->value != NULL) Free(v->value);
 335                 if (v != NULL) Free(v);
 336                 }
 337         return(NULL);
 338         }
 339
 340 char *CONF_get_string(conf,section,name)
 341 LHASH *conf;
 342 char *section;
 343 char *name;
 344         {
 345         CONF_VALUE *v,vv;
 346         char *p;
 347
 348         if (name == NULL) return(NULL);
 349         if (conf != NULL)
 350                 {
 351                 if (section != NULL)
 352                         {
 353                         vv.name=name;
 354                         vv.section=section;
 355                         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 356                         if (v != NULL) return(v->value);
 357                         if (strcmp(section,"ENV") == 0)
 358                                 {
 359                                 p=Getenv(name);
 360                                 if (p != NULL) return(p);
 361                                 }
 362                         }
 363                 vv.section="default";
 364                 vv.name=name;
 365                 v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 366                 if (v != NULL)
 367                         return(v->value);
 368                 else
 369                         return(NULL);
 370                 }
 371         else
 372                 return(Getenv(name));
 373         }
 374
 375 static CONF_VALUE *get_section(conf,section)
 376 LHASH *conf;
 377 char *section;
 378         {
 379         CONF_VALUE *v,vv;
 380
 381         if ((conf == NULL) || (section == NULL)) return(NULL);
 382         vv.name=NULL;
 383         vv.section=section;
 384         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 385         return(v);
 386         }
 387
 388 STACK *CONF_get_section(conf,section)
 389 LHASH *conf;
 390 char *section;
 391         {
 392         CONF_VALUE *v;
 393
 394         v=get_section(conf,section);
 395         if (v != NULL)
 396                 return((STACK *)v->value);
 397         else
 398                 return(NULL);
 399         }
 400
 401 long CONF_get_number(conf,section,name)
 402 LHASH *conf;
 403 char *section;
 404 char *name;
 405         {
 406         char *str;
 407         long ret=0;
 408
 409         str=CONF_get_string(conf,section,name);
 410         if (str == NULL) return(0);
 411         for (;;)
 412                 {
 413                 if (IS_NUMER(*str))
 414                         ret=ret*10+(*str -'0');
 415                 else
 416                         return(ret);
 417                 str++;
 418                 }
 419         }
 420
 421 void CONF_free(conf)
 422 LHASH *conf;
 423         {
 424         if (conf == NULL) return;
 425
 426         conf->down_load=0;      /* evil thing to make sure the 'Free()'
 427                                  * works as expected */
 428         lh_doall_arg(conf,(void (*)())value_free_hash,(char *)conf);
 429
 430         /* We now have only 'section' entries in the hash table.
 431          * Due to problems with */
 432
 433         lh_doall_arg(conf,(void (*)())value_free_stack,(char *)conf);
 434         lh_free(conf);
 435         }
 436
 437 static void value_free_hash(a,conf)
 438 CONF_VALUE *a;
 439 LHASH *conf;
 440         {
 441         if (a->name != NULL)
 442                 {
 443                 a=(CONF_VALUE *)lh_delete(conf,(char *)a);
 444                 }
 445         }
 446
 447 static void value_free_stack(a,conf)
 448 CONF_VALUE *a;
 449 LHASH *conf;
 450         {
 451         CONF_VALUE *vv;
 452         STACK *sk;
 453         int i;
 454
 455         if (a->name != NULL) return;
 456
 457         sk=(STACK *)a->value;
 458         for (i=sk_num(sk)-1; i>=0; i--)
 459                 {
 460                 vv=(CONF_VALUE *)sk_value(sk,i);
 461                 Free(vv->value);
 462                 Free(vv->name);
 463                 Free(vv);
 464                 }
 465         if (sk != NULL) sk_free(sk);
 466         Free(a->section);
 467         Free(a);
 468         }
 469
 470 static void clear_comments(p)
 471 char *p;
 472         {
 473         char *to;
 474
 475         to=p;
 476         for (;;)
 477                 {
 478                 if (IS_COMMENT(*p))
 479                         {
 480                         *p='\0';
 481                         return;
 482                         }
 483                 if (IS_QUOTE(*p))
 484                         {
 485                         p=scan_quote(p);
 486                         continue;
 487                         }
 488                 if (IS_ESC(*p))
 489                         {
 490                         p=scan_esc(p);
 491                         continue;
 492                         }
 493                 if (IS_EOF(*p))
 494                         return;
 495                 else
 496                         p++;
 497                 }
 498         }
 499
 500 static int str_copy(conf,section,pto,from)
 501 LHASH *conf;
 502 char *section;
 503 char **pto,*from;
 504         {
 505         int q,r,rr=0,to=0,len=0;
 506         char *s,*e,*rp,*p,*rrp,*np,*cp,v;
 507         BUF_MEM *buf;
 508
 509         if ((buf=BUF_MEM_new()) == NULL) return(0);
 510
 511         len=strlen(from)+1;
 512         if (!BUF_MEM_grow(buf,len)) goto err;
 513
 514         for (;;)
 515                 {
 516                 if (IS_QUOTE(*from))
 517                         {
 518                         q= *from;
 519                         from++;
 520                         while ((*from != '\0') && (*from != q))
 521                                 {
 522                                 if (*from == '\\')
 523                                         {
 524                                         from++;
 525                                         if (*from == '\0') break;
 526                                         }
 527                                 buf->data[to++]= *(from++);
 528                                 }
 529                         }
 530                 else if (*from == '\\')
 531                         {
 532                         from++;
 533                         v= *(from++);
 534                         if (v == '\0') break;
 535                         else if (v == 'r') v='\r';
 536                         else if (v == 'n') v='\n';
 537                         else if (v == 'b') v='\b';
 538                         else if (v == 't') v='\t';
 539                         buf->data[to++]= v;
 540                         }
 541                 else if (*from == '\0')
 542                         break;
 543                 else if (*from == '$')
 544                         {
 545                         /* try to expand it */
 546                         rrp=NULL;
 547                         s= &(from[1]);
 548                         if (*s == '{')
 549                                 q='}';
 550                         else if (*s == '(')
 551                                 q=')';
 552                         else q=0;
 553
 554                         if (q) s++;
 555                         cp=section;
 556                         e=np=s;
 557                         while (IS_ALPHA_NUMERIC(*e))
 558                                 e++;
 559                         if ((e[0] == ':') && (e[1] == ':'))
 560                                 {
 561                                 cp=np;
 562                                 rrp=e;
 563                                 rr= *e;
 564                                 *rrp='\0';
 565                                 e+=2;
 566                                 np=e;
 567                                 while (IS_ALPHA_NUMERIC(*e))
 568                                         e++;
 569                                 }
 570                         r= *e;
 571                         *e='\0';
 572                         rp=e;
 573                         if (q)
 574                                 {
 575                                 if (r != q)
 576                                         {
 577                                         CONFerr(CONF_F_STR_COPY,CONF_R_NO_CLOSE_BRACE);
 578                                         goto err;
 579                                         }
 580                                 e++;
 581                                 }
 582                         /* So at this point we have
 583                          * ns which is the start of the name string which is
 584                          *   '\0' terminated.
 585                          * cs which is the start of the section string which is
 586                          *   '\0' terminated.
 587                          * e is the 'next point after'.
 588                          * r and s are the chars replaced by the '\0'
 589                          * rp and sp is where 'r' and 's' came from.
 590                          */
 591                         p=CONF_get_string(conf,cp,np);
 592                         if (rrp != NULL) *rrp=rr;
 593                         *rp=r;
 594                         if (p == NULL)
 595                                 {
 596                                 CONFerr(CONF_F_STR_COPY,CONF_R_VARIABLE_HAS_NO_VALUE);
 597                                 goto err;
 598                                 }
 599                         BUF_MEM_grow(buf,(strlen(p)+len-(e-from)));
 600                         while (*p)
 601                                 buf->data[to++]= *(p++);
 602                         from=e;
 603                         }
 604                 else
 605                         buf->data[to++]= *(from++);
 606                 }
 607         buf->data[to]='\0';
 608         if (*pto != NULL) Free(*pto);
 609         *pto=buf->data;
 610         Free(buf);
 611         return(1);
 612 err:
 613         if (buf != NULL) BUF_MEM_free(buf);
 614         return(0);
 615         }
 616
 617 static char *eat_ws(p)
 618 char *p;
 619         {
 620         while (IS_WS(*p) && (!IS_EOF(*p)))
 621                 p++;
 622         return(p);
 623         }
 624
 625 static char *eat_alpha_numeric(p)
 626 char *p;
 627         {
 628         for (;;)
 629                 {
 630                 if (IS_ESC(*p))
 631                         {
 632                         p=scan_esc(p);
 633                         continue;
 634                         }
 635                 if (!IS_ALPHA_NUMERIC_PUNCT(*p))
 636                         return(p);
 637                 p++;
 638                 }
 639         }
 640
 641 static unsigned long hash(v)
 642 CONF_VALUE *v;
 643         {
 644         return((lh_strhash(v->section)<<2)^lh_strhash(v->name));
 645         }
 646
 647 static int cmp(a,b)
 648 CONF_VALUE *a,*b;
 649         {
 650         int i;
 651
 652         if (a->section != b->section)
 653                 {
 654                 i=strcmp(a->section,b->section);
 655                 if (i) return(i);
 656                 }
 657
 658         if ((a->name != NULL) && (b->name != NULL))
 659                 {
 660                 i=strcmp(a->name,b->name);
 661                 return(i);
 662                 }
 663         else if (a->name == b->name)
 664                 return(0);
 665         else
 666                 return((a->name == NULL)?-1:1);
 667         }
 668
 669 static char *scan_quote(p)
 670 char *p;
 671         {
 672         int q= *p;
 673
 674         p++;
 675         while (!(IS_EOF(*p)) && (*p != q))
 676                 {
 677                 if (IS_ESC(*p))
 678                         {
 679                         p++;
 680                         if (IS_EOF(*p)) return(p);
 681                         }
 682                 p++;
 683                 }
 684         if (*p == q) p++;
 685         return(p);
 686         }
 687
 688 static CONF_VALUE *new_section(conf,section)
 689 LHASH *conf;
 690 char *section;
 691         {
 692         STACK *sk=NULL;
 693         int ok=0,i;
 694         CONF_VALUE *v=NULL,*vv;
 695
 696         if ((sk=sk_new_null()) == NULL)
 697                 goto err;
 698         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 699                 goto err;
 700         i=strlen(section)+1;
 701         if ((v->section=(char *)Malloc(i)) == NULL)
 702                 goto err;
 703
 704         memcpy(v->section,section,i);
 705         v->name=NULL;
 706         v->value=(char *)sk;
 707
 708         vv=(CONF_VALUE *)lh_insert(conf,(char *)v);
 709 #ifndef WIN16
 710         if (vv != NULL)
 711                 {
 712                 fprintf(stderr,"internal fault\n");
 713                 abort();
 714                 }
 715 #endif
 716         ok=1;
 717 err:
 718         if (!ok)
 719                 {
 720                 if (sk != NULL) sk_free(sk);
 721                 if (v != NULL) Free(v);
 722                 v=NULL;
 723                 }
 724         return(v);
 725         }